Univ.Chem.2023,38(1),199–205199收稿:2022-02-19;录用:2022-03-24;网络发表:2022-04-12*通讯作者,Email:wangyc1819@126.com基金资助:《分析化学》浙江省一流课程建设项目•化学实验•doi:10.3866/PKU.DXHX202202043www.dxhx.pku.edu.cn工业混合碱各组分含量测定——一种综合型实验方案设计王园朝*,程和勇杭州师范大学材料与化学化工学院,杭州311121摘要:利用两类双指示剂法、BaCl2法和电位滴定法等4种实验方法,分别测定了工业混合碱I(NaOH+Na2CO3)和混合碱II(Na2CO3+NaHCO3)溶液中NaOH、Na2CO3与NaHCO3等3种成分的质量浓度(即单位体积溶液中组分质量)。计算和比较了不同分析方法测定结果的误差和标准偏差,对不同分析方法测定结果进行了显著性检验,并分析了产生误差及造成显著性差异的原因。结果表明:电位滴定法的准确度和精密度均较好,BaCl2法的准确度和精密度较差;BaCl2法与其他3种方法测定结果的数据之间存在显著性差异。本文内容不仅对工业混合碱中各组分含量测定方法提供了一个参考,而且为酸碱滴定实验教学提供了一个综合型实验项目的设计方案。关键词:混合碱;双指示剂法;BaCl2法;电位滴定法;显著性检验;综合型实验方案设计中图分类号:G64;O6DesignofaComprehensiveExperimentforDeterminationofEachComponentinIndustrialMixedAlkaliYuanchaoWang*,HeyongChengCollegeofMaterials,ChemistryandChemicalEngineering,HangzhouNormalUniversity,Hangzhou311121,China.Abstract:Fourexperimentalmethods,includingtwodouble-indicatormethods,theBaCl2methodandthepotentiometrictitrationmethodweredevelopedfordeterminingthemassconcentration(Massofcomponentsinunitvolumeofsolution)ofNaOH,Na2CO3andNaHCO3intwotypesofindustrialmixedalkalisolutions,i.e.,solutionsI(NaOH+Na2CO3)andII(Na2CO3+NaHCO3).Errorsandstandarddeviationsofthefouranalyticalmethodswerecalculatedandcomparedbasedonthemeasurements.Significancetestswerealsoperformedontheresultsofthefourmethods,andpossiblefactors/causesthatledtopooraccuracyandsignificantdifferenceswerealsodiscussed.Itwasconcludedfromtheexperimentalresultsthatthepotentiometrictitrationofferedthehighestaccuracyandprecision,whereastheBaCl2methodsufferedfromthelowestaccuracyandprecisionfromamongthefourmethods.Theresultsalsoshowedsign...